Is it medically impossible to get pregnant from fresh semen on a surface (ie toilet seat) if contact might have been made. why or why not?

Sperm are provided with a limited energy supply & must remain within a moist environment like the genitals to function. They dry quickly & become inactivated when not in a favorable setting. You need to explain how any such material would crawl from their location on the rim of a toilet seat to the inside of a females genitals to trigger pregnancy.

Medically impossible to get pregnant from semen on toilet seat unless you straddle moist fresh semen depositwhilst separating labia to allow sperm to enter vagina & within minutes of being deposited. Sperm fie within minutes unless within warm moist environment of vagina or uterus and would be deposited on thigh & not into vaginal opening which be over opening of toilet seat.